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Projects

Auto-Recharge System

Optus | April 2025

  • Built an event-driven Auto-recharge system on Kafka and PostgreSQL, processing 100K+ transactions/week asynchronously with reliable, scalable throughput.
  • Automated scheduled and low-balance recharge triggers with retry policies to handle failures gracefully.
  • Integrated an external payment service with idempotency keys for exactly-once payment processing on retries.